<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>bootstrap</title>
    <link rel="stylesheet" href="css/bootstrap.min.css">
</head>
<body>
<a href="" class="btn btn-success btn-lg btn-block  disabled">a链接</a>
<input type="button" value="按钮" class="btn btn-info btn-sm">
<button class="btn btn-default btn-xs">按钮</button>
<input type="submit" value="按钮" class="btn btn-default active"  disabled>
</body>
</html>